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Reaction Rate Determination and Correction for Finite Quenching Rate in Shock Induced Pyrolysis of Methane via a Simple Shock Tube FREE

[+] Author Affiliations
J. Hall

Iowa State University and Engineering Research Institute, Ames, IA

J. Herrin

Pratt and Whitney, New Hartford, CT

Paper No. 76-GT-13, pp. V01AT01A013; 12 pages
doi:10.1115/76-GT-13
From:
  • ASME 1976 International Gas Turbine and Fluids Engineering Conference
  • Volume 1A: General
  • New Orleans, Louisiana, USA, March 21–25, 1976
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7974-0
  • Copyright © 1976 by ASME

abstract

Ambiguity in the literature concerning the reaction mechanism of methane pyrolysis still exists, particularly at temperatures below 2100 K. The kinetic results obtained in earlier investigations, in which the reaction progress was followed by direct chemical sampling of the products, subsequent to the reaction, are nearly an order of magnitude larger than those obtained in a more recent study in which the reaction progress was followed by optical methods. In this study, the feasibility of using a simple shock tube, without modifications to enhance the quenching rate, is explored. Such a simple shock tube is used to study the pyrolysis of methane. The rate constant for methane pyrolysis obtained in this study approaches the value reported in an earlier optical study for temperatures above 1750 K. However, the results are subject to considerable scatter. Possible explanations for this scatter are given. Finally, a method is developed to correct the rate constant determinations for any finite-quenching-rate error. This correction, applied to data of this study, resulted in a decrease in the rate constant, bringing it closer to the result of the optical study.

Copyright © 1976 by ASME
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